Expanding the Energetic Limits of Photosynthesis for Broad‐Spectrum Plant Design: Insights from Far‐Red Photosystem I

ABSTRACT Using cryo‐electron microscopy and spectroscopic analyses, demonstrated that Chl f at the A −1B site of the far‐red photosystem I reaction centre directly participates in primary charge separation, thereby providing an atomic‐level structural basis for understanding photochemical reactions beyond the conventional red‐light region. This finding further offers potential design targets for engineering spectral expansion in crop photosynthesis.